Survey of Household Energy Use (SHEU) Summary Report. December 2005

Transcription

1 2003 Survey of Household Energy Use (SHEU) Summary Report December 2005

2 Natural Resources Canada s Office of Energy Efficiency Leading Canadians to Energy Efficiency at Home, at Work and on the Road To obtain additional copies of this or other free publications on energy efficiency, please contact: Energy Publications Office of Energy Efficiency Natural Resources Canada c/o St. Joseph Communications Order Processing Unit 1165 Kenaston Street PO Box 9809 Station T Ottawa ON K1G 6S1 Tel.: (toll-free) Fax: (613) TTY: (613) (teletype for the hearing-impaired) Cat. No. M / ISBN Her Majesty the Queen in Right of Canada, 2006 Recycled paper

3 Table of Contents I. INTRODUCTION II. SURVEY FINDINGS Analytical Summary Scope of Survey Trends in Household Energy Use Changing Characteristics of Canadian Houses Changing Characteristics of Residential Heating Changing Characteristics of Air Conditioning of Houses Changing Characteristics of Appliances The Stock of Dwellings in Canada General Characteristics of Dwellings Energy Intensity The Thermal Envelope Insulation of the Thermal Envelope Windows Energy Efficiency Improvements Residential Heating Main Heating Systems Energy Source for Heating Supplementary Heating Energy-Conserving Heating Equipment Air Conditioning and Ventilation of Households Air-Conditioning Systems Regional Analysis Types of Air-Conditioning Systems Central Ventilation Systems Household Appliances Major Appliances Other Appliances Hot Water Water Heating Hot Water Conservation Devices Lighting Lighting Choices Regional Analysis Number of Light Bulbs ENERGY STAR ENERGY STAR Heating and Air-Conditioning Systems ENERGY STAR Major Appliances ENERGY STAR Other Appliances ENERGY STAR Appliances Regional Analysis III. APPENDIX A Glossary Summary Report i

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5 I INTRODUCTION In 1993, Statistics Canada conducted an extensive survey for Natural Resources Canada (NRCan) entitled 1993 Survey of Household Energy Use (SHEU 1993). This survey provided an opportunity to collect detailed data on the energy consumption habits of households in Canada to be used by what would become the Office of Energy Efficiency (OEE). The OEE decided to periodically conduct additional Surveys of Household Energy Use in a continuing effort to assess the changing characteristics of household energy consumption across Canada. The second Survey of Household Energy Use collected data for 1997 (SHEU 1997), and the third collected data for 2003 (SHEU 2003). 1 These surveys tie in directly with the OEE s mandate to strengthen and expand Canada s commitment to energy efficiency in order to reduce greenhouse gas (GHG) emissions that contribute to climate change. Natural Resources Canada s Office of Energy Efficiency (OEE) offers a wide range of programs and services to improve energy efficiency in every sector of the Canadian economy, including the residential sector. The OEE s Equipment Program helps Canadians make energy-efficient choices when buying, selling or manufacturing energy-using equipment. The OEE s Housing Program offers resources to help Canadians keep their homes comfortable and well ventilated for healthy indoor air quality while reducing energy costs for home heating. For more information on these and other programs, as well as tools, financial incentives, free publications and other resources to help save energy and reduce GHG emissions, visit oee.nrcan.gc.ca. If you would like to learn more about this publication or the OEE s services, please contact us by at euc.cec@nrcan.gc.ca. The primary objective of SHEU 2003 was to gather information on energy use and the factors affecting energy use in households residing in houses and residential buildings with fewer than five storeys. More precisely, the survey involved collecting information on This summary report was prepared by Glen Ewaschuk of the Demand Policy and Analysis Division of the OEE. Indrani Hulan and Jean-François Bilodeau supervised the project, Vincent Fecteau and Michel Blais provided data assistance, and David McNabb provided project leadership. dwelling characteristics usage of appliances and other energy-consuming products energy efficiency characteristics energy consumption The purpose of this summary report is to provide an overview of the main findings of SHEU A more detailed report entitled 2003 Survey of Household Energy Use Detailed Statistical Report is also available. To learn more about this survey and the topics discussed in this document, please contact: Glen Ewaschuk Economist Office of Energy Efficiency Natural Resources Canada 580 Booth Street, 18th Floor Ottawa ON K1A 0E4 euc.cec@nrcan.gc.ca 1 Statistics Canada conducted SHEU 2003 in 2004 and therefore refers to it as the 2004 Survey of Household Energy Use. However, the reference period for this survey is the calendar year 2003 (that is, all data presented are for households during the 2003 calendar year). Therefore, this report refers to the survey as the 2003 Survey of Household Energy Use (SHEU 2003). Summary Report 1

6 II SURVEY FINDINGS Analytical Summary Data from SHEU 2003 found that the average heated area of a Canadian dwelling was 1321 square feet (sq. ft.) in The average heated area of a Canadian dwelling has increased with each Survey of Household Energy Use (SHEU). Dwellings constructed after 1979 were, on average, larger and more energy efficient than dwellings constructed before The energy source used by households for space and water heating was primarily based on the location of the household within the country. The majority of households located west of Quebec used natural gas, while the majority of households in Quebec used electricity. Most households in the Atlantic region used either electricity or oil. The penetration rate 2 for condensing (highefficiency) furnaces was 62 percent among dwellings constructed during that used a natural gas, propane or oil furnace. Nearly one quarter of Canadian households used three or more television sets in The penetration rate for both central and window/ room air conditioners increased from SHEU 1997 to SHEU Also, Ontario households accounted for 60 percent of all air-conditioning systems used in Canada in Almost 25 percent of the light bulbs used by the average Canadian household were energyefficient light bulbs, such as halogen light bulbs, fluorescent tubes and compact fluorescent lights. ENERGY STAR qualified products, which are among the most energy-efficient products on the market, have had a high penetration since the inception of the ENERGY STAR Initiative in Canada. However, a significant number of households did not know if their products were ENERGY STAR qualified, which may have resulted in an underestimation of the penetration rate of ENERGY STAR qualified products. An increasing number of basements / crawl spaces, attics / crawl spaces and attached garages are being insulated. SHEU 2003 found that more households used both a main and a secondary refrigerator than did the previous SHEUs. These additional refrigerators were also increasing in capacity. These trends have also coincided with a decrease in the penetration rate for freezers. 2 Penetration rate is the percentage of a sample population that used a given product during a specific time. For the purposes of this report, the sample population is Canadian households (unless otherwise stated) during Survey of Household Energy Use (SHEU)

7 II SURVEY FINDINGS Scope of Survey The third Survey of Household Energy Use (SHEU 2003) used 2003 as its reference year. The previous SHEUs used 1993 and 1997 as their respective reference years. SHEU 2003 covers over 11 million households across Canada. The survey is representative of households in all 10 Canadian provinces that resided in single detached houses, double/row houses, duplexes, 3 mobile homes and apartments in buildings with fewer than five storeys (low-rise apartments). Households in the territories were excluded in order to remain consistent with previous SHEUs. Chart 1 Location of Households by Region British Columbia Atlantic 13% 8% Prairies The survey data were collected through computerassisted personal interviews with dwelling owners and renters. Also, landlords of rented dwellings and property managers of condominiums were interviewed in an attempt to obtain the most accurate responses possible. Landlords and property managers were asked questions only about the dwelling s heating and cooling equipment, features and conditions, energy use and energy consumption. Energy consumption data were obtained through either the energy supplier(s) of the household or the household providing the data from 2003 energy bills or statements. 17% 35% Ontario Quebec 27% SHEU 2003 found that, in 2003, the regional breakdown of households across Canada was as follows: Ontario, 35 percent; Quebec, 27 percent; the Prairies, 17 percent; British Columbia, 13 percent; and the Atlantic region, 8 percent (see Chart 1). More detail about the methodology used for SHEU 2003 and a copy of the SHEU 2003 questionnaire can be found in the 2003 Survey of Household Energy Use Detailed Statistical Report. 3 Duplexes will be included in the double/row houses category for comparison purposes throughout this report. Summary Report 3

8 II SURVEY FINDINGS Trends in Household Energy Use Although each Survey of Household Energy Use has evolved to incorporate the changing characteristics of household energy consumption, a few essential topics have continued to be covered by each survey (SHEU 1993, SHEU 1997 and SHEU 2003). This provides an opportunity to evaluate developments in the Canadian residential sector through a comparison of findings from 1993, 1997 and For comparison purposes, this section refers only to elements that are common to all three surveys. Also, this section presents data only from single detached houses, double/row houses and mobile homes. Data from low-rise apartments are excluded because the sample population of SHEU 1997 did not include this type of dwelling. Finally, since the methodology used for all of the surveys was not exactly the same, 4 it should be noted that some of the discrepancies between the surveys might be partially attributable to methodological differences. Changing Characteristics of Canadian Houses Heated Area The heated area of a house is defined as the total floor space of a house excluding the basement and the garage. Chart 2 Average Heated Area of Houses (sq. ft.) As shown in Chart 2, the average heated area of houses 5 across Canada has increased with each version of SHEU. The 1993 version found that the average heated area of a house was 1378 sq. ft. Next, SHEU 1997 observed that the average heated area of a house had increased to 1405 sq. ft. Finally, SHEU 2003 data show that the average heated area of a house in Canada had once again increased, to reach 1425 sq. ft. Basements Basements can be a prime source of heat loss within a house. In fact, basements can account for 20 percent to 35 percent of a house s total heat loss. 6 Canadian homeowners seem to have become more aware of this, as the percentage of fully insulated basements / crawl spaces has increased from 42 percent in SHEU 1993 to 51 percent in SHEU 1997 and to 60 percent in SHEU 2003 (see Chart 3). Chart 3 Percentage of Basements / Crawl Spaces With Full, Partial and No Insulation on Inside Walls % 27% 20% % 22% 20% % 51% 60% SHEU 1993 SHEU 1997 SHEU 2003 SHEU 1993 SHEU 1997 SHEU 2003 No insulation Partial insulation Full insulation 4 For example, the wording of questions and possible responses may have been refined from one survey to the next. 5 Includes single detached houses, double/row houses and mobile homes. 6 Natural Resources Canada, Keeping the Heat In EnerGuide, Gatineau, 2004, p Survey of Household Energy Use (SHEU)

9 Trends in Household Energy Use II SURVEY FINDINGS There has also been a corresponding decrease in the percentage of basements / crawl spaces that had no insulation at all. In 1993, nearly one out of every three basements had no insulation. This ratio has decreased to one out of every five basements in Changing Characteristics of Residential Heating Average Age of Main Heating System The average age of the main heating system in Canadian dwellings has gradually increased with each SHEU, from 12 years in SHEU 1993 to 14 years in SHEU 1997 to 15 years in SHEU 2003 (see Chart 4). As for the average age of the prominent types of main heating systems, electric baseboards have seen the largest increase in average age, going from 11 years to 19 years over the course of the three surveys. Similarly, the average age of heat pumps has also increased, but at a slower rate, starting from 6 years in SHEU 1993 and reaching 10 years in SHEU Other types of heating systems, such as furnaces and heating stoves, had average ages that slightly increased from SHEU 1993 to SHEU 1997 and then remained constant from SHEU 1997 to SHEU seem to have contributed to the increase in the popularity of gas fireplaces in Canadian homes. This increase can be seen by comparing the penetration rate of gas fireplaces in all three SHEUs. The penetration rate for gas fireplaces has steadily increased, from 5 percent in SHEU 1993 to 19 percent in SHEU 2003 (see Chart 5). In contrast, the penetration rate for wood fireplaces declined slightly, from 31 percent to 27 percent, over the same period. Chart 5 Penetration Rate of Fireplaces by Type of Fireplace 31% 5% 31% SHEU 1993 SHEU 1997 SHEU 2003 Wood-burning 12% 27% Gas-burning 19% Fireplaces Gas fireplaces have become a cleaner-burning and potentially more energy-efficient alternative to conventional wood fireplaces. 7 Many homeowners are more attracted to gas fireplaces because of their ease of use, cleanliness and environmental benefits than conventional wood fireplaces. These factors Chart 4 Average Age of Main Heating System (years) SHEU 1993 SHEU 1997 SHEU 2003 All heating systems Electric baseboards Hot-air furnace Hot-water furnace Heating stove Heat pump Other Natural Resources Canada, All About Gas Fireplaces, Gatineau, 2004, p. 2. Summary Report 5

10 II SURVEY FINDINGS Trends in Household Energy Use Changing Characteristics of Air Conditioning of Houses From SHEU 1993 to SHEU 1997, the penetration rate for central air conditioners increased from 15 percent to 22 percent, while the penetration rate for window/room air conditioners remained stable at 10 percent (see Chart 6). Data from SHEU 2003 found that the penetration rates for central air conditioners and window/room air conditioners had increased to 32 percent and 13 percent respectively. These increases since SHEU 1997 have coincided with warmer-than-average Canadian summers since 1998, with the exception of the summer of Chart 6 Penetration Rate of Air-Conditioning Systems by Type of System 32% When a refrigerator has a capacity greater than 16.4 cu. ft., it is classified in the large or very large refrigerator capacity category. The proportion of main refrigerators with a large or very large capacity has steadily increased, from 49 percent in SHEU 1993 to 67 percent in SHEU 2003 (see Chart 7). In contrast, the proportion of secondary refrigerators with a large or very large capacity increased slightly, from 23 percent in SHEU 1993 to 26 percent in SHEU 1997, but then jumped in SHEU 2003 to 35 percent. Chart 7 Percentage of Main and Secondary Refrigerators With a Capacity Greater Than 16.4 cu. ft. 49% 59% 67% 15% 22% 10% 10% 13% 23% 26% 35% SHEU 1993 SHEU 1997 SHEU 2003 SHEU 1993 SHEU 1997 SHEU 2003 Main refrigerator Secondary refrigerator Central air conditioner Window/room air conditioner Selected Appliances Changing Characteristics of Appliances Main and Secondary Refrigerators Refrigerators in general have become more energy efficient in recent years. 9 Given this fact, it is not unexpected that an increasing proportion of main refrigerators used by houses had a capacity larger than 16.4 cubic feet (cu. ft.). These models consume the same amount of energy as older models that had less capacity. As with main refrigerators, an increasing proportion of secondary refrigerators had a capacity larger than 16.4 cu. ft. There has been a steady decline in the penetration rate for freezers, from 75 percent in SHEU 1993 to 69 percent in SHEU 2003 (see Chart 8 on page 7). This decline has coincided with an increase in the penetration rate of secondary refrigerators, from 25 percent in SHEU 1993 to 36 percent in SHEU 2003, and the previously discussed increase in the capacity of main and secondary refrigerators. Therefore, households seem to be slowly replacing freezers with additional and larger refrigerators, which include freezer sections. 8 Natural Resources Canada, Energy Use Data Handbook 1990 and 1997 to 2003, Gatineau, 2005, p Natural Resources Canada, Energy Consumption of Major Household Appliances Shipped in Canada Trends , Gatineau, 2005, p Survey of Household Energy Use (SHEU)

11 Trends in Household Energy Use II SURVEY FINDINGS Chart 8 Penetration Rate of Selected Appliances Freezers Secondary refrigerators Dishwashers 25% 33% 36% 54% 59% 61% 75% 72% 69% Microwave ovens 86% 92% 95% Personal computers 28% 49% 70% SHEU 1993 SHEU 1997 SHEU 2003 As was the case with secondary refrigerators, the penetration rates of many other appliances have increased over the 10 years since SHEU For example, the penetration rate of dishwashers in Canadian households has increased, from 54 percent to 61 percent. Also, the penetration rate for microwave ovens has increased, to the point where almost every household used a microwave oven in Additionally, there has been a dramatic increase in the penetration rate for personal computers, as it has risen from 28 percent to 70 percent. Note: The results presented in this section excluded data from low-rise apartments. Unless otherwise stated, the analysis in the following sections covers the entire SHEU 2003 sample, which includes low-rise apartments. Summary Report 7

12 II SURVEY FINDINGS The Stock of Dwellings in Canada A dwelling is a living space that is structurally separate from others, with a private entry that permits access to the exterior of the building or to a stairwell or common corridor. There are many different types of dwellings across Canada with varying characteristics, such as size and year of construction. The interaction of these dwelling characteristics, along with other factors, influences the energy intensity level of a household. General Characteristics of Dwellings Year of Construction In 2003, almost 60 percent of Canadian residential dwellings were constructed after 1969 (see Chart 9). Among these dwellings, there was almost an equal proportion constructed in the seventies, in the eighties and from 1990 to As for dwellings built before 1970, only one third were built before 1946, while the remaining two thirds were built between 1946 and Chart 9 Year of Construction of Dwellings Heated Area The heated area of a dwelling is defined as the total floor space of a dwelling excluding the basement and the garage. SHEU 2003 found that 37 percent of dwellings had a heated area of less than 1001 sq. ft., and 36 percent had a heated area between 1001 and 1500 sq. ft. (see Chart 10). The remaining dwellings, which had a heated area larger than 1500 sq. ft., accounted for 27 percent of all dwellings. The average heated area of a Canadian dwelling was 1321 sq. ft. Chart 10 Heated Area of Dwellings % Before % 186 to 232 m 2 (2001 to 2500 sq. ft.) 232 or more m 2 (2501 or more sq. ft.) 6% 56 m 2 or less (600 sq. ft. or less) 5% 9% % % 139 to 186 m 2 (1501 to 2000 sq. ft.) 16% 56 to 93 m 2 (601 to 1000 sq. ft.) 28% 21% % 93 to 139 m 2 (1001 to 1500 sq. ft.) Year of construction is a determining factor in energy intensity analysis, which will be discussed later in this section of the report. Another determining factor in energy intensity analysis is the heated area of a dwelling Survey of Household Energy Use (SHEU)

13 The Stock of Dwellings in Canada II SURVEY FINDINGS A regional analysis reveals that the average heated area of dwellings varied significantly by region in 2003 (see Chart 11). Chart 11 Heated Area by Region (sq. ft.) 1321 Canada Dwellings in Ontario had the largest average heated area at almost 1500 sq. ft. British Columbia dwellings had an average heated area of over 1400 sq. ft., while the average heated areas of dwellings in both the Atlantic region and the Prairies were over 1200 sq. ft. The only region where dwellings had an average heated area of less than 1200 sq. ft. was Quebec. This result was to be expected, given that the types of dwellings prevalent in Quebec differed greatly from those in the other regions in This will be discussed further in the following sub-section. Chart Dwelling Types of Households Low-rise apartments 18% 1128 Mobile homes 2% Atlantic Quebec Ontario Prairies British Columbia Dwelling Type Across Canada in 2003, 65 percent of dwellings were single detached houses and 15 percent were double/row houses (see Chart 12). The remaining types of dwellings were low-rise apartments and mobile homes, which respectively accounted for 18 percent and 2 percent of all dwellings. Typically, certain dwelling types have larger heated areas than other dwelling types. In 2003, the average heated area of a single detached house was 1475 sq. ft., and for a double/row house, it was 1266 sq. ft. (see Chart 13). These two types of dwellings were much larger than the average low-rise apartment (861 sq. ft.) and mobile home (981 sq. ft.). Chart 13 Heated Area by Dwelling Type (sq. ft.) 1475 Single detached houses 1266 Double/row houses Regionally, nearly half of all low-rise apartments across Canada were in Quebec. Since low-rise apartments were the dwelling type with the smallest average heated area, it was anticipated that Quebec would be the region with the smallest average heated area per dwelling. 861 Low-rise apartments 981 Mobile homes Double/ row houses 15% Single detached houses 65% Energy Intensity In this report, energy intensity is defined as the total amount of energy consumed per unit of heated area. It is expressed in gigajoules per square metre (GJ/m 2 ). The energy intensity level of a household depends on the interaction of many factors. And although these factors are difficult to isolate and study individually, SHEU 2003 enables us to determine the main factors influencing energy consumption. Summary Report 9

14 II SURVEY FINDINGS The Stock of Dwellings in Canada Regional Intensity While the average household energy intensity levels of the Atlantic region (1.06 GJ/m 2 ), Quebec (0.94 GJ/m 2 ) and Ontario (0.99 GJ/m 2 ) were relatively close to the Canadian average of 1.01 GJ/m 2, the same cannot be said for the Prairies and British Columbia (see Chart 14). The Prairies had the highest intensity of any region, with a ratio of 1.31 GJ/m 2. In contrast, the region with the lowest intensity was British Columbia, which had a ratio of 0.80 GJ/m 2. built before 1946 were at least 58 years old in 2003, so some of these dwellings have probably undergone some type of retrofit, 10 which would have improved their energy efficiency. Chart 15 Energy Intensity by Year of Construction (GJ/m 2 ) Chart 14 Energy Intensity by Region (GJ/m 2 ) Before Canada Many factors can be used to help explain these regional discrepancies, including differences in climate, types of energy used and general dwelling characteristics, such as year of construction, heated area and dwelling type. Year of Construction Atlantic Quebec Ontario Prairies British Columbia Construction standards, techniques and materials vary considerably over time and exert a direct impact on energy use. The influence of these construction factors on a dwelling s energy use is evident when a comparison is made between the energy intensity ratios of dwellings built in different periods. This unexpected outcome does not, however, hold true for dwellings built since 1945, as the more recently constructed dwellings had lower energy intensity ratios. This can be seen by observing the decline in the ratio, from 1.15 GJ/m 2 for dwellings built during to 1.05 GJ/m 2 during and to 0.87 GJ/m 2 during The energy intensity ratio remained stable at the level of 0.87 GJ/m 2 for dwellings constructed during Therefore, dwellings constructed during and were, on average, the most energy-efficient dwellings built in Canada. Heated Area Based on SHEU 2003 data, the energy intensity of a dwelling decreases as its heated area increases. This negative relationship between heated area and intensity is evident when dwellings are divided into categories based on their heated area, and the average intensities of dwellings within each category are compared. It is surprising to see in Chart 15 that dwellings built before 1946 had a lower energy intensity ratio (1.09 GJ/m 2 ) than dwellings built during (1.15 GJ/m 2 ). A possible explanation is that dwellings 10 A retrofit is any type of improvement of efficiency of energy-consuming appliances or thermal characteristics of the dwelling Survey of Household Energy Use (SHEU)

15 The Stock of Dwellings in Canada II SURVEY FINDINGS Dwellings in the smallest heated area category (less than 56 m 2 ) had the highest energy intensity, with a ratio of 1.63 GJ/m 2 (see Chart 16). If the heated area is increased to the next category (56 m 2 to 93 m 2 ) the intensity declines to a ratio of 1.25 GJ/m 2. This trend of increasing heated area and declining intensity continues to the largest heated area category (more than 232 m 2 ) which had the lowest intensity with a ratio of 0.77 GJ/m 2. Chart 16 Energy Intensity by Heated Area (GJ/m 2 ) Another possible explanation for the decline in energy intensity ratios with an increase in heated area is the tendency for larger dwellings to have been constructed during the most recent periods, which were or (see Chart 17). And, as previously discussed in this section, dwellings constructed during these periods were, on average, the most energy-efficient dwellings built in Canada. Dwelling Type Since the average low-rise apartment and mobile home had smaller heated areas than the other dwelling types, and given that smaller dwellings generally had higher energy intensity ratios than larger dwellings, it is not surprising that low-rise apartments and mobile homes were the dwelling types with the highest intensity ratios, at 1.10 GJ/m 2 and 1.01 GJ/m 2 respectively (see Chart 18). 56 m 2 or less (600 sq. ft. or less) 56 to 93 m 2 (601 to 1000 sq. ft.) 93 to 139 m 2 (1001 to 1500 sq. ft.) 139 to 186 m 2 (1501 to 2000 sq. ft.) 186 to 232 m 2 (2001 to 2500 sq. ft.) 232 m 2 or more (2501 or more sq. ft.) Chart 18 Energy Intensity by Dwelling Type (GJ/m 2 ) 1.10 One reason for this negative relationship between the heated area of a dwelling and its energy intensity level is that many energy-consuming products, such as refrigerators, are considered necessities and are used by a high proportion of households regardless of their heated area. Obviously, these types of products have a greater impact on the energy intensity ratio of a smaller dwelling than a larger dwelling, since there is less heated area in a smaller dwelling. Chart 17 Average Heated Area by Year of Construction (sq. ft.) Single detached houses 0.95 Double/row houses Low-rise apartments 1.01 Mobile homes Also, as shown in Chart 18, it is not unexpected that double/row houses had a lower intensity ratio (0.95 GJ/m 2 ) than single detached houses (1.00 GJ/m 2 ). This is because a double/row house has at least one common wall with another house. A common wall reduces a dwelling s exposure to the exterior and enables a house to share heat with the adjacent house, therefore permitting a house to reduce its own energy consumption. Before Summary Report 11

16 II SURVEY FINDINGS The Stock of Dwellings in Canada Given that low-rise apartments normally have at least two common walls, it could be considered surprising that this type of dwelling had the highest energy intensity ratio. However, other factors, such as the previously mentioned average heated area of low-rise apartments, may have diminished the influence of common walls on reducing the energy intensity level of low-rise apartments. Another factor may have been that only 32 percent of low-rise apartments were constructed since 1980, which was the lowest percentage among the dwelling categories. It can be concluded that being responsible for paying for its energy consumption may also be a factor affecting a household s energy intensity level. The interaction of this factor with the energy-efficient practices of a household and the other factors previously discussed such as regional climate, energy sources used, dwelling type, year of construction and heated area of a dwelling influence the energy intensity level of a household. An additional factor that may have influenced the high energy intensity ratio of low-rise apartments in 2003 was payment for energy consumed (see Chart 19). Low-rise apartments where someone other than the occupant (e.g. a landlord) was responsible for paying for at least one of the dwelling s energy sources had an energy intensity ratio of 1.62 GJ/m This was in stark contrast to the energy intensity ratio of 0.68 GJ/m 2 for low-rise apartments where the household was responsible for paying for all of its energy consumption. This suggests that a household may have been more conscious of its energy efficiency if it was responsible for paying for all of its energy consumption. Chart 19 Energy Intensity Among Low-Rise Apartments by Responsibility for Payment for Energy Consumption (GJ/m 2 ) Household not responsible for payment for all energy consumption Household responsible for payment for all energy consumption 11 In cases where a low-rise apartment used a central heating system, the energy consumed by the apartment was an estimate based on the total energy consumption of the entire apartment building. Please refer to the methodological section of the 2003 Survey of Household Energy Use Detailed Statistical Report for more information Survey of Household Energy Use (SHEU)

17 II SURVEY FINDINGS The Thermal Envelope The thermal envelope is the shell of a dwelling that protects us from the elements; it comprises the basement walls and floor, the above-grade walls, the roof and the windows and doors. To maintain our indoor environment, the envelope must control the flow of heat, air and moisture from the inside of the dwelling to the outdoors. Insulation of the Thermal Envelope Insulation wraps a dwelling in a layer of material that slows the rate at which heat is lost to the outdoors. And since heat flows from warmer to colder areas, it is important to insulate the entire thermal envelope. This includes the basement / crawl space, attic / crawl space and attached garage. As reported in the Trends in Household Energy Use section of this report, each version of SHEU found fewer dwellings in Canada with no insulation in their basements / crawl spaces. Therefore, Canadian households awareness of the importance of insulating their basements seems to be increasing. The same type of awareness also appears to be increasing for attics / crawl spaces. In 2003, nearly 90 percent of attics / crawl spaces across Canada were insulated (see Chart 20). This result does not vary greatly based on the year of construction of dwellings. Nevertheless, there is a noticeable upward trend from dwellings built before 1946 (83 percent of attics / crawl spaces were insulated) until (91 percent of attics / crawl spaces were insulated). The proportion of attics / crawl spaces that were insulated then declined slightly to 90 percent for dwellings constructed during Although SHEU 2003 found that the vast majority of basements / crawl spaces and attics / crawl spaces were insulated, the same cannot be said for garages attached to dwellings. Only 54 percent of dwellings with an attached garage had an insulated garage in Chart 20 Proportion of Attics / Crawl Spaces That Were Insulated, by Year of Construction 88% All households 83% 86% 88% 91% Before % It is important to insulate an attached garage because heat moves in any direction up, down or sideways as long as it is moving from a warm spot to a colder one. For example, a heated room over a garage will lose heat through the floor. Awareness of this fact seems to be increasing as dwellings with attached garages constructed during the most recent period, , were most apt to have an insulated garage (see Chart 21 on page 14). Moreover, the majority of dwellings with attached garages constructed after 1969 had insulated garages. Conversely, only 34 percent of dwellings with attached garages constructed before 1970 had insulated garages. The significance of these results is magnified by the increasing trend for dwellings to be constructed with attached garages instead of separate garages. Summary Report 13

18 II SURVEY FINDINGS The Thermal Envelope Chart 21 Proportion of Attached Garages That Were Insulated, by Year of Construction 54% 44% 32% 51% 54% 68% year of construction and air leaks or drafts around windows (see Chart 23). Older dwellings were more prone to have air leaks or drafts around windows than more recently constructed dwellings. The percentage of dwellings reporting air leaks or drafts around windows decreased in each successive period, from dwellings built before 1946 (45 percent) up until (20 percent). Chart 23 Percentage of Dwellings With Window Drafts and Condensation Problems, by Year of Construction All households Only 31 percent of dwellings with garages constructed before 1946 had an attached garage (see Chart 22). This percentage has dramatically increased in each successive period, peaking at 94 percent for dwellings constructed during Therefore, with an increasing number of recently constructed dwellings having attached garages, it is imperative that the awareness of the importance of insulating attached garages also continues to grow. Chart 22 Type of Garage Among Dwellings With a Garage, by Year of Construction 69% 31% Windows Before % 53% 31% 17% Before Attached 69% 83% Not attached Windows can be responsible for unnecessary heat loss, high energy consumption and cold drafts and can be subject to condensation problems. SHEU 2003 data show that there is a link between a dwelling s 6% 94% % 41% 36% 43% 33% 41% 29% 45% Before Air leaks or drafts around windows 20% 41% Condensation on the inside surfaces of windows Another problem associated with windows is condensation. Condensation problems on the inside surfaces of windows were reported by 42 percent of Canadian households. However, unlike air leaks and draft problems, condensation problems do not appear to be linked with the year of construction of the dwelling, as a comparable percentage of dwellings constructed in each period reported this problem. Condensation on the inside surfaces of windows can be the result of moisture problems and/or air leakage problems. Moisture problems can lead to windowframe damage and mould, while air leakage problems can lead to excessive heat loss and energy consumption. Moisture problems caused by excessive humidity levels can arise from poor ventilation within the dwelling. Ventilation can be improved with the use of an air exchanger, which will be discussed in the Air Conditioning and Ventilation of Households section of this report. 12 Air leakage problems can be addressed by installing new 12 Natural Resources Canada, Keeping the Heat In EnerGuide, p Survey of Household Energy Use (SHEU)

19 The Thermal Envelope II SURVEY FINDINGS windows or adding weatherstripping and caulking. 13 In 2003, about 13 percent of households installed at least one new window, and about 14 percent made improvements to the weatherstripping or caulking on at least one of their windows (see Chart 24). These measures can help reduce air leakage and draft problems and reduce a household s energy consumption. Another way to improve the energy efficiency of a dwelling s windows is to put up plastic film on the windows during the heating season. This is an inexpensive and easy way to improve the heat retention of a dwelling and also reduce window condensation. 14 SHEU 2003 found that 13 percent of Canadian households did this in Chart 24 Percentage of Households That Made an Energy Efficiency Window Improvement in 2003, by Type of Improvement Installed at least one new window Improvements made to the caulking or weatherstripping of windows Plastic film used on windows in heating season 12.7% 13.0% 13.5% Energy Efficiency Improvements Homeowners and landlords / property managers were asked if they made any improvements to their dwelling that reduced energy consumption in Possible energy efficiency improvements included improvements to the following: The survey found that 15 percent of dwellings underwent at least one of these energy efficiency improvements, and 40 percent of these dwellings underwent multiple improvements in Additionally, there were plans for 16 percent of Canadian dwellings to go through at least one of these improvements in Among homeowners and landlords / property managers who did not make any improvements in 2003 and were not planning on making any improvements in 2004, the majority of them (64 percent) stated that improvements were not necessary (see Chart 25). Another 17 percent said that improvements were too costly, and 2 percent said they were not aware of or there did not exist any available government aid or assistance for the improvements. Chart 25 Reasons for Not Making Any or Not Planning On Making Any Improvements in 2003 or 2004 Not aware of or there did not exist any government financial aid or assistance 2% Improvements too costly 17% Do not have time 1% Other 11% Don t know 5% No improvements necessary 64% the roof structure or surface the exterior wall siding the insulation of the roof or attic the insulation of the basement or crawl space walls the insulation of any exterior walls (excluding the basement) the foundation the heating equipment the ventilation or air-conditioning equipment 13 Natural Resources Canada, Improving Window Energy Efficiency (fact sheet) EnerGuide for Houses, Ottawa, 2004, p Natural Resources Canada, Keeping the Heat In EnerGuide, p.109. Summary Report 15

20 II SURVEY FINDINGS Residential Heating Households use energy primarily for space and water heating, space cooling, the operation of appliances and lighting. Of these activities, space heating utilizes the most energy in the residential sector. It accounted for 60 percent of the total residential energy consumed in As a result, SHEU 2003 examined the types of heating equipment used by households, as well as the characteristics of the equipment, usage tendencies, supplementary heating equipment and prevalence of energy-saving heating equipment. Main Heating Systems In 2003, the majority of Canadian households, 63 percent, used a furnace as their main heating system (see Chart 26). Over 80 percent of these furnaces were hot-air systems, and the remaining furnaces were hot-water systems. Among the other types of heating systems used by Canadian households, electric baseboards were the most popular, with a penetration rate of 26 percent. The rest of the market was divided among heating stoves (4 percent), heat pumps (4 percent) and other equipment (3 percent). Chart 26 Main Heating System of Households Electric baseboards 26% Heating stove 4% Hot-water furnace 11% Heat pump 4% Other equipment Hot-air furnace A regional analysis reveals that each region, with the exception of the Atlantic region, had one type of 3% 52% heating system that the majority of households used in 2003 (see Chart 27). In Quebec, electric baseboards were used by over 60 percent of households for their main heating system. In regions west of Quebec, the majority of households used hot-air furnaces. In contrast to these regions where the majority of households used one specific type of system, the Atlantic region had an almost equal proportion of households using electric baseboards (33 percent) or hot-air furnaces (31 percent) to heat their dwellings. Chart 27 Main Heating System by Region Region Heating System Penetration Rate Atlantic Electric baseboards 33% Hot-air furnace 31% Quebec Electric baseboards 61% Ontario Hot-air furnace 76% Prairies Hot-air furnace 82% British Columbia Hot-air furnace 50% Energy Source for Heating The regional differences observed with main heating systems are once again found with the energy source used by heating systems, as each region, again with the exception of the Atlantic region, had one energy source in particular that the majority of households used (see Chart 28 on page 17). In Quebec, electricity was used by almost 75 percent of households to power their main heating system. In regions west of Quebec, the majority of households used natural gas. And once again, in contrast to the other regions where the majority of households used one specific heating energy source, the Atlantic region had an almost equal proportion of households using oil (39 percent) or electricity (38 percent) as their main heating energy source. 15 Natural Resources Canada, Energy Use Data Handbook 1990 and 1997 to 2003, p Survey of Household Energy Use (SHEU)

21 Residential Heating II SURVEY FINDINGS Chart 28 Main Heating System by Region Region Energy Source Penetration Rate Atlantic Oil 39% For Canada as a whole, more households used natural gas to run their main heating system (46 percent) than any other energy source (see Chart 29). Other sources used by households for their main heating system were electricity, used by 33 percent of households; oil, used by 9 percent; and wood, used by 3 percent. Additionally, 6 percent of households used a combination of two sources of energy to power their main heating system. Over 50 percent of these dual-heating-source households used a combination of electricity and natural gas. Supplementary Heating Electricity 38% Quebec Electricity 73% Ontario Natural gas 68% Prairies Natural gas 78% British Columbia Natural gas 52% Chart 29 Main Energy Source for Household Heating Electricity 33% Wood 3% Dual source 6% Oil 9% Other 3% Natural gas 46% One quarter of Canadian households used a secondary heating system to complement their main heating system during 2003 (see Chart 30). Interestingly, over 80 percent of these households which used a supplementary heating system did not have any common walls with another dwelling. As was previously discussed in The Stock of Dwellings in Canada section, a common wall can reduce the demand on a household s main heating system and, therefore, its need for supplementary heating. This relationship can be observed by comparing the penetration rates of supplementary heating systems for dwellings with and without common walls. Chart 30 Penetration Rate of Supplementary Heating Systems by Dwelling Type 25% All housesholds 31% Single detached houses 19% Double/row houses Dwellings without any common walls, such as single detached houses and mobile homes, had high penetration rates for supplementary heating systems (31 percent and 35 percent respectively). Double/row houses, which normally have at least one common wall, had a lower penetration rate (19 percent) and low-rise apartments, which normally have at least two common walls, had the lowest penetration rate (8 percent). Another relationship that could be assumed is that the need for supplementary heating systems would diminish for more recently constructed dwellings since the quality of construction materials and practices, dwelling insulation and main heating systems have all improved over time. As shown in Chart 31 (on page 18), this assumption is accurate when the penetration rate of supplementary heating systems for dwellings built before 1946 (33 percent) is compared with the rate for dwellings constructed during (24 percent). However, this assumption does not hold true for dwellings built since 1946, as their penetration rate has remained steady (around 25 percent). 8% Low-rise apartments 35% Mobile homes Summary Report 17

22 II SURVEY FINDINGS Residential Heating Chart 31 Penetration Rate of Supplementary Heating Systems by Year of Construction 33% 24% 23% 23% 25% Even though this increasing penetration rate is beneficial towards reducing total residential energy consumption, its effects are somewhat diminished since nearly one out of every four programmable thermostats was not programmed in 2003 (see Chart 33). A programmable thermostat must be programmed in order to realize its full energysaving potential. Chart 33 Proportion of Programmable Thermostats That Were Programmed Before Energy-Conserving Heating Equipment Not programmed 23% Programmable Thermostats Programmable thermostats automatically adjust a dwelling s temperature setting, allowing households to save energy while they are away or sleeping. This energy-saving technology has become more common among Canadian households that have control over their dwelling s temperature (see Chart 32). The penetration rate for programmable thermostats has increased, from 28 percent for dwellings with temperature control that were constructed during to 32 percent for those built during and finally peaking at 39 percent for those built during This emerging trend has resulted in 31 percent of all Canadian households with temperature control using this technology in Chart 32 Penetration Rate of Programmable Thermostats Among Households With Temperature Control, by Year of Dwelling Construction 31% All households 25% 29% 28% 32% Before % Condensing Furnaces Programmed 77% Condensing furnaces are the most energy-efficient furnaces available on the market today. This is especially true if their energy source is natural gas or propane, as these furnaces can use 33 percent to 38 percent less energy than old furnaces and 10 percent less energy than a standard-efficiency furnace. 16 Conversely, a condensing oil furnace has the potential to be only marginally more efficient than a well-designed mid-efficiency oil furnace. 17 In 2003, condensing furnaces were used in 37 percent of all households that used a furnace fuelled by natural gas, propane or heating oil. Since these high-efficiency furnaces are a relatively new technology having appeared on the Canadian market over the last 20 years 18 it is not at all unexpected to see that the penetration rate for this technology was higher for recently built dwellings (see Chart 34 on page 19). The penetration rate among dwellings constructed during that used a natural gas, propane or oil furnace was 62 percent. This was extremely high compared with 16 Natural Resources Canada, Choose the Right Condensing Gas Furnace (fact sheet) EnerGuide, Ottawa, 2003, p Natural Resources Canada, Heating with Oil EnerGuide, Gatineau, 2004, p Natural Resources Canada, Heating with Gas EnerGuide, Ottawa, 2004, p Survey of Household Energy Use (SHEU)